Complementary chromatic adaptation' is associated with

Options

A. Blue green algae
B. Eubacteria
C. Mycoplasma
D. All of these

Answer

To solve the question "Complementary chromatic adaptation' is associated with," we need to analyze the options provided: blue-green algae, eubacteria, mycoplasma, and all of these.

### Step-by-Step Solution:

1. **Understanding Complementary Chromatic Adaptation**:
- This is a phenomenon observed in photosynthetic organisms where they can adjust their pigment content in response to changes in light intensity and wavelength.

2. **Identifying Photosynthetic Organisms**:
- Photosynthetic organisms, like cyanobacteria (blue-green algae), can modulate their pigments to optimize photosynthesis based on the light conditions they encounter.

3. **Evaluating the Options**:
- **Blue-Green Algae (Cyanobacteria)**: These are indeed photosynthetic prokaryotes that exhibit complementary chromatic adaptation. They can change their pigment composition in response to different light conditions.
- **Eubacteria**: This group includes a wide range of bacteria, but not all are photosynthetic. However, cyanobacteria, which are photosynthetic, fall under this category.
- **Mycoplasma**: These are the smallest living cells and lack a cell wall. They are not photosynthetic and do not exhibit complementary chromatic adaptation.
- **All of These**: This option would imply that all listed organisms exhibit this adaptation, which is incorrect since mycoplasma does not.

4. **Conclusion**:
- The correct answer is **blue-green algae (Cyanobacteria)**, as they are the primary organisms associated with complementary chromatic adaptation.

### Final Answer:
Complementary chromatic adaptation is associated with **blue-green algae (Cyanobacteria)**.